Bok Choy in Zone 8B — Southeast

Bok choy is a fantastic addition to your Southeast garden. Its mild, slightly sweet flavor makes it a versatile ingredient in stir-fries, soups, and salads. Plus, it's quick to mature, meaning you can enjoy fresh greens even with our long, hot summers.

While the Southeast's humidity and potential for fungal diseases can be a concern, careful timing and proper spacing can help you grow healthy bok choy. Our 255-day growing season gives you a great window of opportunity for success with this cool-season crop.

Starting bok choy indoors makes sense if you want an extra-early spring harvest, or you are trying to get a jump start on flea beetles. Sow seeds indoors from early to late February, about four weeks before you plan to transplant.

Use seed trays with a good seed-starting mix. Keep them warm and provide plenty of light, either from a sunny window or grow lights. Bottom watering is a great way to keep the soil consistently moist without overwatering. Our moderate spring means you have a little leeway, but don't wait too long, or the plants will get leggy.

Transplant your bok choy seedlings outdoors from early March through late April. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week.

Space plants 6-10 inches apart in well-drained soil. Be mindful of late cold snaps, which can happen in early March. Row covers can offer protection if needed.

Direct sowing bok choy is an easy and reliable method for Southeast gardeners. You can direct sow from late February through late September.

Prepare your soil by loosening it and adding compost. Sow seeds about ¼ inch deep and keep the soil consistently moist. Thin seedlings to 6-10 inches apart. Direct sowing is particularly useful for succession planting throughout our long growing season.

Bok choy needs consistent moisture, especially in our hot and humid Southeast climate. Aim for about 1 inch of water per week, either from rainfall or irrigation.

During the hotter summer months, you might need to water more frequently. Use the finger test – if the top 2 inches of soil feel dry, it's time to water. Water at the base of the plants to avoid wetting the leaves, which can encourage fungal diseases in our humid conditions.

In the spring and fall, our reliable rainfall often takes care of much of the watering. Signs of underwatering include wilting leaves, while overwatering can lead to yellowing leaves and root rot. Mulching around your plants with straw or pine straw helps retain moisture and regulate soil temperature, which is helpful when our summers get intense.

You can expect your first bok choy harvest from early April through late November. Bok choy is ready to harvest about 45 days after planting.

Harvest baby bok choy when it's 6-8 inches tall, or wait for full size at 12-15 inches. Cut the plant above the base, leaving the roots intact, and it may regrow for a second harvest.

Continue harvesting throughout the season by picking outer leaves as needed. As our first frost approaches in mid- November, harvest any remaining bok choy to prevent damage.

Here are some common problems you might encounter growing bok choy in the Southeast:

Flea Beetles

• What it looks like: Tiny round holes (shot-hole pattern) in leaves, especially on young seedlings. You might see small, dark beetles that jump when disturbed.
• What causes it: These small jumping beetles love to feed on brassicas. They're most damaging to young plants.
• How to fix/prevent it: Use row covers to protect seedlings during their vulnerable stage. Delay planting until plants are larger. Kaolin clay coating and neem oil spray can help. Interplant with basil or catnip.

Cabbage Worms

• What it looks like: Smooth green caterpillars on your bok choy leaves with irregular holes. You might also see dark green droppings and white butterflies hovering around.
• What causes it: These are the larvae of white cabbage butterflies, and they can have multiple generations in our long, warm season.
• How to fix/prevent it: Bt spray is very effective. Use floating row covers to prevent the butterflies from laying eggs. Handpick caterpillars when you see them. Interplant with aromatic herbs like thyme and sage to deter them.

Slugs

• What it looks like: Irregular holes in leaves, especially on low-growing plants. Look for silvery slime trails on leaves and soil. Damage is worse at night and in wet weather.
• What causes it: Slugs feed at night in moist conditions and hide under mulch and debris during the day.
• How to fix/prevent it: Use beer traps (shallow dishes of beer sunk into the soil). Iron phosphate bait is pet-safe. Remove hiding spots. Water in the morning so the soil surface dries by evening. Copper tape around beds and diatomaceous earth around plants can also help.

Bolting in Heat

• What it looks like: Your bok choy sends up a flower stalk. The leaves become tough and bitter, and the harvest quality declines.
• What causes it: This happens when your cool-season crop experiences extended warm temperatures above its comfort zone. Bok choy bolts when days consistently exceed 80°F.
• How to fix/prevent it: Time your plantings for the cooler spring and fall. Choose bolt-resistant varieties. Provide shade during warm spells. Mulch to keep the soil cool. Harvest before bolting progresses too far.

Southeast Specific Challenges: The combination of heat and humidity in the Southeast can create a perfect environment for fungal diseases on your bok choy. Ensure good air circulation by spacing plants properly. Also, be vigilant about checking for pests, as they can thrive in our warm climate.

Good companions for bok choy include garlic and onions, whose pungent scents deter pests. Beets help loosen the soil, improving drainage. Lettuce and spinach, as leafy greens, share similar growing requirements and can be planted nearby.

Avoid planting bok choy near strawberries, as they compete for nutrients. Tomatoes are also not ideal companions because they attract some of the same pests that bother bok choy.